Wall jack



Oct. 6, 1959 Filed March 26, 1956 M. w. COLEMAN 2,907,477

WALL "JACK 2 Sheets-Sheet 1 INVENTOR. MARVIN W Comm/v WW WP 2,907,477 Fatented Oct. 6, 1959 United States ate nice WALLJACK Marvin w. Coleman, Dearborn, Mich. Application March 26, 1956 Serial No. 573,746

1 Claim. or. 214-1 ricated in horizontal position.

Another object of the invention is to provide a wall jack comprising a base, a gyn pole pivoted to the base and a lifting member attachable to the wall with means such as a winch and cable associated with the gyn pole and connected to the lifting member for moving the latter along the length of the gyn pole to raise the wall or the like attached to the lifting member.

A further object of the invention is to provide a gyn pole having stop means at'intervals along thelength thereof for preventing'back travel of the lifting member.

: Thus, if for any reason, such as a break in cable, the

lifting member should move down suddenly relative to the g'yn pole, the stop means will positively break the downward movement of the lifting member.

Still another object of the invention is to provide a wall jack having provision for preventing the lifting member from becoming separated from the gyn pole. In the event of a cable break, for example, the downward movement of the lifting member takes place with such force and suddenness that it tends to push or throw the gyn pole back away from the wall. It is essential that the lifting member and gyn pole do not become separated since in that event the lifting member will bypass the stop means on the gyn pole and the wall or the like attached thereto would come crashing down.

Still anotherobject of the invention is to provide means facilitating'the movement of the lifting member along the gyn pole.

A still further object of the invention is to provide means for preventing the relative movement of the lifting member away from the gyn pole in a direction transversely of the path of swinging movement of the gyn pole.

Other objects'of the invention will become apparent as the following description proceeds, especially when consideredin connection with the accompanying drawings, wherein: V

Figure 1 is a perspective view showing two wall jacks embodying the present invention, the wall jacks being shown lifting a wall into raised position.

Figure 2 -is,;a perspective view of a wall jack. Figure 3 is a sectional view taken along the line 3-3 on Figure 2.

Figure 4 is an elevational view of the upper end portion of the wall jack.

Figure 5 is a sectional view taken along the line 5-5 on Figure 2.

Figure 6 is a view taken along the line 6-6 on Figure 5.

2. Referring now more particularly to the drawings, a pair of identical wall jacks, generally indicated at 10,

are shown in Figure 1 in the act of raising a wall W' from horizontal position to upright position. Each wall jack. 10 comprises a base 12and a gyn pole or boom 14.

The base comprises a pair of laterally spaced angle mem- -bers 16 which extend parallel to one another and which are connected by a cylindrical shaft 18 having its opposite ends extending through the upright flanges of the angle members and rigidly secured thereto. The coplanar horizontal flanges 20 of each angle'mernber are formed with a plurality of openings so that the base may be secured toa supporting surface by nailing.

The gyn pole or boom 14 comprises an elongated channel member 22. An attaching frame 24 is rigidly secured to the boom adjacent the lower end thereof.

Specifically, the frame includes a pair of legs 26 which extend from the connecting portion 28 of the frame in diverging relation toward the lower end of the channel member 22. The connecting portion is secured directly,

to the base 30 of the channel member 22 by suitable fastening elements.

An open-ended tube 32 extends between and is secured to the free ends of the legs 26, and the tube loosely receives shaft 18 to permit rotation of the tube and, hence, the entire boom 14 about the axis of the shaft 18. When, as usually happens, the base is supported on a horizontal surface, the shaft 18 is also horizontal and the boom or,

A pair of plates 33 are secured to the apertured flange of angle member 36 in laterally spaced parallel relation.

A shaft 40 extends through and is secured rigidly to plates 38 with rollers 42 respectively journaled for rota- These rollers. are adapted to have a rolling engagement with the base tion on the opposite ends of the shaft.

36 of the channel member 22. The channel member 22 has side flanges 44 which are parallel and extend at right angles to the base 30, and the rollers are respectively disposed closely adjacent to the side flanges 44 to practically eliminate any movement of the lifting member transversely of the path of swinging movement of the boom.

It will be noted that a pair of flanges 46 extend laterally inwardly from the free edges of the flanges 44. The

flanges 46 extend parallel to the base of the channel member and in the same plane, overlying the rollers to prevent the lifting member from becoming separated from the channel member 22 during the lifting operation.

This relationship can bestbe seen in Figures 5 and 6.

Means including a cable 48 are provided for raising the lifting member 34 relative tothe boom. The cable 48 has one end secured to a pin 50 connecting theplates 38 and is trained over a pulley 52 beyond the upper end of the channel member Specifically, the pulley 52 is journaled on a stub sh aft 54 extending between the angle members 56 which are rigidly secured in parallel relation to the base 30 of the channel member at the outer side thereof. The other end of the cable is operated by a winch indicated at 58. The winch includes a reel 60 about which the cable is wound, and a crank 62 for rotating the reel 60 through suitable gearing (not shown). A dog 63 is provided cooperable with the gearing to permit the reel to be wound only in a direction to into the rounded head portions 74. The stop members are. adapted for cooperating with the pivoted dog 76.

Dog 76 has its upper end pivoted on a pin 78 secured to and extending between plates 38. The dog is in the form of an angle plate, and the bottom surface of the free end portion thereof has a concave recess 8t adapted to receive headv portion 74 of, the stop members. The transverse surface 82 at the free end of the dog is incliued at approximately the. same angle as the cam surface 72 to enable the dog to cam past the stop members during its upward travel. However, when the lifting member moves downwardly relative to the channel member 22, the head portion 74 of a stop member extends into the concave recess 82 to prevent further downward movement of the lifting member.

A pin 84 is rigidly secured to and extends between shaft 40 and the apertured flange 37 of angle member 36. The dog 76 has an opening for loosely receiving the pin and a compression coil spring 86 encircles the pin and has its opposite'ends abutting the angle member 36 and the dog 76. As a result, the spring 86 normally holds the dog in theposition shown in Figure 5, the dog, however, being able to calm past the stop members against the action of the spring during upward. movement.

It will be noted in Figure 2 that the flanges 46 termi nate'short of thelower end of the channel member 22. This is to permit the rollers 42 of the lifting member to lifting operation.

In operation, the lifting member is separated from the channel member and the attaching angle member 36 thereof is secured to the wall to be lifted by any suitable means such as by nailing. The wall will be lying flat on a supporting surface with side W" down and it is a simple matter to lift the wall slightly with a wedge or hammer claw to insert flange 100 of angle member 36 under the wall. The flange 37 is attached by nailing. The base of the device is then positioned close to the lifting member so that the rollers 42 thereof may be inserted into the channel member at the lower end. The base is then nailed to the floor, and by operation of the winch, the lifting member will be raised along the length of the boom. Usually, as in Figure 1, the floor is horizontal so the boom swings in a vertical plane about the horizontal axis of shaft 18 during the lifting operation. As the wall is raised, the dog 76 will cam past the successive stop members 70. However, iffor any reason the lifting member shoudsuddenly move down with respect to the boom as, for example, if the cable should break, the dog will cooperate with the stop mem-' ber located immediately therebeneath to prevent further downward movement of the lifting member and thereby prevent the wall from crashing down on the supporting surface. t

The. lifting member is closely held within the confines of. the channel. member so that the dog will 'not be moved out of operative relationship with the stop stations. during thev lifting operation. Also, the rollers 42 V be inserted within the channel at the beginning of the 4 provide a near frictionless movement of member.

What I claim as my invention is:

A jack comprising a base, an elongated boom members, means pivotally mounting one end of said boom member to said base for swinging movement in a generally vertical plane, a lifting member attachable to a building wall or the like and supported on said boom member for movement along the length thereof, said members being provided with cooperating engaging means for guiding the movement of said'lifting member lengthwise along said boom member and positively preventing lateral separation of said lifting member from said boom member, means for moving said lifting mem ber along the length of said boom member in a direction away from said one end thereof to raise a building wall or the like attached thereto, and means independent of said moving means for preventing movement of said lifting member along the length of said boom member in. the opposite direction, said lifting member and. said last mentioned means comprising a plurality of stops permanently mounted on said boom member, a pair of spaced apart right triangular plates having a vertical and a horizontal leg and also having the acute corners thereof re-- moved, said plates being held parallel to each other in the lifting spaced relation by an angle shaped member which is adapted to be moved parallel to said boom member, the back of one leg of said angle member being rigidlyattached. to the vertical leg of said plates, thehorizontal leg of said plates extending from said angle member toward said boom member, the other leg of said angle member extending outwardly from. the boom member, three axle members extending between said plates along. the hypotenuse thereof, including an upper axle member to which said moving means is attached, a lower axle member having anti-friction rollers attached. to the ends thereof which are engageable with said boom member, and a middle axlemember having a second angle mem ber which is in back to back relationship with said first mentioned angle member pivotally mounted thereon, said; pivot being at the tip of the vertical leg of said second angle member, the horizontal leg of said second angle member being below said lower axle member and extending substantially to said boom member, a dowel member extending between the first mentioned angle; member and the lower lower axle member through said second angle member and carrying a spring mounted between the two angle members, whereby said pivotally mounted second angle member is pressed against said lower axle member causing said second angle member tocam past said stops when the lifting member is moved in one direction, said stops and second angle member acting together to prevent. movement of said. "lifting mem-. her in the opposite direction.

References Cited in the file of this patent UNITED STATES PATENTS 866,913 Carlucci Sept. 24, 1907 1,029,823 Richardson June 18, 1912 1,306,431 Klemme June 30, 1919 1,554,608 Van Ryzin Sept. 22, 1925 1,798,456 Carroll Mar. 31, 1931 1,799,307 Manley Apr. 7, 1.931 2,465,796 Freeman Mar. 29, 1949 FOREIGN PATENTS 1,097,591 France Feb. 16, 1955 

